docs: def print_float(self, value, decimal_digits=2, justify_right=True):
          """Print a numeric value to the display.  If value is negative
          it will be printed with a leading minus sign.  Decimal digits is the
          desired number of digits after the decimal point.
          """
          format_string = '{{0:0.{0}F}}'.format(decimal_digits)
          self.print_number_str(format_string.format(value), justify_right)